Fountain pen



' Dec. 10, 1929. T. PEARSON 1,739,325

FOUNTAIN PEN Filed Aug. 1'7. 192'? g 1 IINVENTOR V 1 THOMAS PEARSON I 1ATTORNEY Patented Dec. 10, 1929 THOMAS PEARSON, OF SYRACUSE, NEW YORKFOUNTAIN PEN Application filed August 17, 1927.

My invention relates to a fountain pen, and

has for its general object to provide a founmerely illustrative of oneexample of the invention.

Figure 1 is a view partly in longitudinal section and partly inelevation, showing a fountain pen embodying my invention.

Figure 2 is a similar View with the cap removed and showing the positionof the parts in filling the pen.

Figure 3 is a cross section on the line 33 of Figure 1. Figure 4 is anelevation of the filling plunger.

In carrying out my invention in practice in accordance with theillustrated example,

a barrel or hollow body 10 is provided to hold ink, said barrel havingany approved pen holding means 11 adapted to receive a pen nib l2.Fitting snugly in the barrel 10 is a hollow plunger 13 which is adaptedto have sliding movement in said barrel, drawing in ink by suction,owing to the fitof the plunger in the barrel. and adjacent to the headexternal threads 15 are adapted when the plunger is 1n the forwardposition to engage internal threads 16 formed in the barrel 10 at therear or upper end. A vent hole 17 is formed in the tubular plunger 13 atthe threads 15 so that when the threads 15 are engaged with the threads16, the rear end of the barrel 10 will form a closure of the vent hole17, as when the pen is in use.

The numeral 18 indicates the usual cap on fountain pens, which fits atits forward end on the head 14, and 19 indicates the clip for holdingthe pen to the pocket.

In practice, to fill the pen, the plunger 13 is turned through themedium of the head 14 until the threads 15 are disengaged from the Saidplunger has a head 14,

Serial No. 213,657.

threads 16, and thereby the plunger 13 may be reciprocated in the barrel10. In filling the pen, a finger is placed over the vent hole 17 toclose the same so that as the plunger 13 1s moved outwardly in thebarrel 1O suction will be produced and ink be drawn into the barrel 10.Repeated filling movements of the plunger 13 may be made in accordancewith the amount of ink desired to be drawn into the barrel. In movingthe plunger 13 forwardly the vent hole 17 is uncovered so that the airin the vent hole and plunger may escape. The barrel first having beenfilled to the desired extent, the plunger 13 is moved inwardly and thevent hole 17 being open the ink will rise in the plunger 13, asindicated in Figure 1.

As best seen in Figure 4, an annular groove 120 is formed in the plunger13 near the inner eiid to receive a packing ring 20 to increase thetightness of the fit of the plunger in the barrel 10. Also in theplunger 13 some distance from the inner end I produce an annular grooveor grooves 21 in which any slight leakage past the packing ring 20 willbe trapped and collected. Again, near the inner end of the plunger 13 Iproduce an auxiliary second hole 22 which, it will be observed, isadditional to the vent hole 17. The hole 22 acts as an indicator wherebythe one filling the pen may observe that the ink has risen to the hole22. Said hole 22 is distant sufficient from the packing ring 20 so thatthe closure of the barrel 10 is not disturbed while the hole 22 isexposed above the rear or upper end of the barrel.

I would state furthermore that while the illustrated example constitutesa practical embodiment of my invention, I do not limit myself strictlyto the exact details herein illustrated, since, manifestly, the same canbe considerably varied without departure from the spirit of theinvention as defined in the appended claim.

I claim:

In a fountain pen, a barrel adapted to receive ink, and a hollow plungeradapted to be reciprocated in said barrel and fitting snugly therein,said plunger having a vent hole adjacent the rear end adapted to beclosed fordrawing ink into the barrel by a rearward movement of theplunger, said plunger furthermore having a second hole therein asufficient distance from the inner end to permit of said second holeshowing above the rear end of the barrel while the extreme end of theplunger is still in the barrel.

Signed at Syracuse in the county of Onondaga and State of New York this12th day of August, A. D. 1927. a g 7 THOMAS PEARSON.

